Anthalona vandammei sp. nov. from Thailand, a sibling species of Neotropical Anthalona brandorffi (Sinev & Holwedell, 2002) (Cladocera: Anomopoda: Chydoridae) Author Sinev, Artem Y. Biological Faculty, M. V. Lomonosov Moscow State University, Leninskie gory, Moscow 119991, Russia. Author Tiang-Nga, Supatra 0000-0003-0764-1612 Applied Taxonomic Research Center, Department of Biology, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand. su. tiangnga @ gmail. com; https: // orcid. org / 0000 - 0003 - 0764 - 1612 su.tiangnga@gmail.com Author Sanoamuang, Laorsri 0000-0003-0764-1612 Applied Taxonomic Research Center, Department of Biology, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand. su. tiangnga @ gmail. com; https: // orcid. org / 0000 - 0003 - 0764 - 1612 & International College, Khon Kaen University, Khon Kaen 40002, Thailand. su.tiangnga@gmail.com text Zootaxa 2023 2023-01-19 5230 1 67 78 journal article 228909 10.11646/zootaxa.5230.1.4 0024f8c4-da85-484b-bf6d-2aed7f8d62e9 1175-5326 7550516 7B400661-51BB-47E7-BB3C-6BE3B679991F Key for Anthalona species of South-East Asia 1a . IDL seta 3 with long distal portion, armed with thin setules of equal thickness.................................................................................................. Anthalona sanoamuangae Sinev & Kotov, 2012 . 1b . IDL seta 3 with thick spine at the middle and shortened distal portion armed with thin setulae, or IDL seta 3 armed with several long spines.......................................................................................... 2 2a . IDL seta 3 with thick spine at the middle and shortened distal portion armed with thin setulae......................... 3 2b. IDL seta 3 armed with several long spines.................................................................. 5 3a. Cosmaria of lateral pores flower-like............................................. Anthalona milleri (Kiser, 1948) 3b. Cosmaria of lateral pores bilobed......................................................................... 4 4a. IDL setae 2-3 thick, curved, claw-like; distal portion of seta 3 shorter than its basal spine. Anterior margin of labral keel with a blunt denticle bearing a spinule.......................... Anthalona harti harti Van Damme, Sinev & Dumont, 2011 . 4b. IDL setae 2-3 moderately thick, weakly curved; distal portion of seta 3 longer than its basal spine. Anterior margin of labral keel with a blunt denticle lacking a spinule........................ Anthalona obtusa Van Damme, Sinev & Dumont, 2011 . 5a. Posterior setae of valves short, posteriormost setae located before posteroventral angle of valves. IDL setae 2-3 armed with spines of similar thickness and length................... Anthalona spinifera Tiang-nga, Sinev & Sanoamuang, 2016 . 5b . Posterior setae of valves long, posteriormost setae located at posteroventral angle of valves. IDL setae 2-3 with basal spine much thicker and longer than others............................................. Anthalona vandammei sp. nov.